Air-brake.



N0. 797,,336v PATENTED AUG. 15, 1905.. 13. B. TEMPLE.

AIR BRAKE.

APPLIUATIOH 13mm 001.29,1904.

WITNESSES: j'M/ENTQR EDWIN B. TEMPLE, OE BOSTON, blASSACHUSETTS.

MHQ HWWE.

Specification of Letters Patent.

Patented. Aug. 15, 1905.

Application filed October 29, 1904. Serial No. 230,516.

To ail whom, it may concern.-

Be it known that l, Enwm B. TEMPLE, a citizen oi the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented certain new and useful improvements in Air-Brakes; and Ido hereby declare the following to be a full, clear, and exactdescription of theinveution, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to air-brakes on railroad trains; and it consistsin the novel construction and combination of the parts hereinafter fullydescribed and claimed.

iln the drawings, Figure l is a plan view showing a diagram of arailroad-car provided with appliances according to this invention. Fig.2 is a detailed plan view showing the connections between one of thedoors and the train-pipe. Fig. 3 is a side view of the same.

A. is a railroad-car of any approved construction.

B is the air-cylinder which operates the brake mechanism, and C is thetrain-pipe. The air-brake mechanism is of any approved construction, andthe train-pipe under the car extends under all the cars of the train andcontains compressed air while the train is in motion and the brakes arenot applied. The compressed air is let out of the train-pipe in order toapply the brakes in the ordinary manner, and the air-brake mechanism isnot herein described at greater length, as it is of any approvedconstruction.

In order to prevent the train from being started before the doors areclosed, and in order to prevent the numerous accidents which occur fromthe premature starting of the train, the following apparatus isprovided.

Dis one of the side doors of the car A. This door is a sliding door atabout the mid dle oi the car; but it may be a hinged door or a door inany other position, and all the doors of the car may be provided withappliances according to this invention.

E is a pipe for compressed air which is connected to the train-pipe andwhich is provided with a valve E, which is arranged in convenientproximity to the door D. An outlet pipe or branch E extends from thevalve to any convenient point.

G is a toothed wheel secured on the spindle f of the valve F, and H is atoothed rack secured to the door and engaging with the said toothedwheel. The valve F is a stop-valve of any approved construction. Thisvalve remains open as long as the door is open, and passengers can enteror leave the car. As this valve is open, there is little or no pres sureof air in the train-pipe, and the airbrakes are consequently applied, sothat the train cannot be started.

When the car-door is closed, it closes the valve F, and when the lastcar-door has been closed the air-pressu re rises in the train-pipe. Themotorman or engineer is notified of the closing of all the car-doors byhis pressuregage, which is connected with the trairrpipe, and is therebyenabled to start the train without delay.

The opening of a car-door operates to apply the air-brakesautomatically, so that the train is quickly stopped.

hat T claim is 1. The combination, witha railroad-carprovided with adoor, and air-brake mechanism provided with a train-pipe which containscompressed air when the brakes are not applied; of an air-relief pipeconnecting the said trainpipe with the atmosphere, and a stop-valveinserted in the said air-relief pipe and operatively connected with thesaid door so that the said door and valve are opened and closedsimultaneously.

2. The combination, with arailroad-carprovided with a door, andair-brake mechanism provided with a train -pipe which containscompressed air when the brakes are not applied; of an air-pipe connectedto the said train-pipe. a stop-valve inserted in the said air-pipe, atoothed wheel secured on the operating-spindle of the said valve, and atoothed rack secured to the said door and engaging with the said wheel,so that the opening and closing of the said door and valve are etlectedsimultaneously.

In testimony whereoil have al'lixed my signature in the presence of twowitnesses.

EDWlN B. TEMPLE.

Witnesses:

ARTHUR E. Rowsn, FREDK. K. DAGG-E'JT.

